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MCQs

Total Questions : 757 | Page 12 of 76 pages
Question 111. Tunnel kilns are usually used for
  1.    Roasting of pyrites
  2.    Drying/tempering of refractories
  3.    Reheating of slabs
  4.    Melting of glass
 Discuss Question
Answer: Option B. -> Drying/tempering of refractories
Question 112. Which of the following is not a directly fired furnace?
  1.    By-product coke oven
  2.    Calcination kiln
  3.    Sintering furnace
  4.    Open hearth furnace
 Discuss Question
Answer: Option A. -> By-product coke oven
Question 113. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
  1.    Furnace employing neutral atmosphere
  2.    Carbon resistance furnace
  3.    Reducing atmosphere
  4.    Furnace employing negative pressure
 Discuss Question
Answer: Option B. -> Carbon resistance furnace
Question 114. Thermal efficiency of furnaces can be improved by
  1.    Waste heat recovery from flue gas
  2.    Minimising heat losses from furnace walls
  3.    Maintaining proper draught
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 115. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
  1.    Physical nature, ash content and fineness of the coal
  2.    Amount of excess air supplied and load on the boiler
  3.    Type of burner and combustion chamber
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 116. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
  1.    Low reactivity of carbonised residue containing high proportion of iron & sulphur
  2.    Low forced draft & fuel bed temperature
  3.    Thick firebed and preheated primary air
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 117. Which one is not an induced draught furnace?
  1.    Blast furnace stove
  2.    Sintering furnace
  3.    High pressure boiler
  4.    None of these
 Discuss Question
Answer: Option A. -> Blast furnace stove
Question 118. Ostwald charts are meant for
  1.    Computing the excess/deficiency of combustion air
  2.    Calculation of flue gas temperature
  3.    Computation of flue gas analysis
  4.    None of these
 Discuss Question
Answer: Option A. -> Computing the excess/deficiency of combustion air
Question 119. In which of the following furnaces, the gases are sucked through the stock bed from below?
  1.    Soaking pit
  2.    Sintering machine
  3.    Beehive oven
  4.    None of these
 Discuss Question
Answer: Option B. -> Sintering machine
Question 120. A refractory wall separating the stock and the source of heat is provided in a
  1.    Updraft kiln
  2.    Muffle furnace
  3.    Continuous furnace
  4.    None of these
 Discuss Question
Answer: Option B. -> Muffle furnace

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